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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Nathan Scott7b718762005-11-02 14:58:39 +11002 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
Nathan Scott7b718762005-11-02 14:58:39 +11005 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * published by the Free Software Foundation.
8 *
Nathan Scott7b718762005-11-02 14:58:39 +11009 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 *
Nathan Scott7b718762005-11-02 14:58:39 +110014 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#ifndef __XFS_BUF_H__
19#define __XFS_BUF_H__
20
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#include <linux/list.h>
22#include <linux/types.h>
23#include <linux/spinlock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include <linux/mm.h>
25#include <linux/fs.h>
26#include <linux/buffer_head.h>
27#include <linux/uio.h>
Dave Chinnere80dfa12013-08-28 10:18:05 +100028#include <linux/list_lru.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029
30/*
31 * Base types
32 */
33
Nathan Scottce8e9222006-01-11 15:39:08 +110034#define XFS_BUF_DADDR_NULL ((xfs_daddr_t) (-1LL))
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
Nathan Scottce8e9222006-01-11 15:39:08 +110036typedef enum {
37 XBRW_READ = 1, /* transfer into target memory */
38 XBRW_WRITE = 2, /* transfer from target memory */
39 XBRW_ZERO = 3, /* Zero target memory */
40} xfs_buf_rw_t;
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
Carlos Maiolino6fb8a902012-08-10 15:01:51 -030042#define XBF_READ (1 << 0) /* buffer intended for reading from device */
43#define XBF_WRITE (1 << 1) /* buffer intended for writing to device */
44#define XBF_READ_AHEAD (1 << 2) /* asynchronous read-ahead */
45#define XBF_ASYNC (1 << 4) /* initiator will not wait for completion */
46#define XBF_DONE (1 << 5) /* all pages in the buffer uptodate */
47#define XBF_STALE (1 << 6) /* buffer has been staled, do not find it */
Dave Chinnerac8809f2013-12-12 16:34:38 +110048#define XBF_WRITE_FAIL (1 << 24)/* async writes have failed on this buffer */
Christoph Hellwig1d5ae5d2011-07-08 14:36:32 +020049
50/* I/O hints for the BIO layer */
Carlos Maiolino6fb8a902012-08-10 15:01:51 -030051#define XBF_SYNCIO (1 << 10)/* treat this buffer as synchronous I/O */
52#define XBF_FUA (1 << 11)/* force cache write through mode */
53#define XBF_FLUSH (1 << 12)/* flush the disk cache before a write */
Linus Torvalds1da177e2005-04-16 15:20:36 -070054
Christoph Hellwig807cbbd2010-06-24 11:49:12 +100055/* flags used only as arguments to access routines */
Carlos Maiolino6fb8a902012-08-10 15:01:51 -030056#define XBF_TRYLOCK (1 << 16)/* lock requested, but do not wait */
57#define XBF_UNMAPPED (1 << 17)/* do not map the buffer */
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
Christoph Hellwig807cbbd2010-06-24 11:49:12 +100059/* flags used only internally */
Carlos Maiolino6fb8a902012-08-10 15:01:51 -030060#define _XBF_PAGES (1 << 20)/* backed by refcounted pages */
61#define _XBF_KMEM (1 << 21)/* backed by heap memory */
62#define _XBF_DELWRI_Q (1 << 22)/* buffer on a delwri queue */
63#define _XBF_COMPOUND (1 << 23)/* compound buffer */
Christoph Hellwig6ab455e2008-05-19 16:34:42 +100064
Christoph Hellwig807cbbd2010-06-24 11:49:12 +100065typedef unsigned int xfs_buf_flags_t;
Linus Torvalds1da177e2005-04-16 15:20:36 -070066
Christoph Hellwig0b1b2132009-12-14 23:14:59 +000067#define XFS_BUF_FLAGS \
68 { XBF_READ, "READ" }, \
69 { XBF_WRITE, "WRITE" }, \
Christoph Hellwig1d5ae5d2011-07-08 14:36:32 +020070 { XBF_READ_AHEAD, "READ_AHEAD" }, \
Christoph Hellwig0b1b2132009-12-14 23:14:59 +000071 { XBF_ASYNC, "ASYNC" }, \
72 { XBF_DONE, "DONE" }, \
Christoph Hellwig0b1b2132009-12-14 23:14:59 +000073 { XBF_STALE, "STALE" }, \
Dave Chinnerac8809f2013-12-12 16:34:38 +110074 { XBF_WRITE_FAIL, "WRITE_FAIL" }, \
Christoph Hellwig1d5ae5d2011-07-08 14:36:32 +020075 { XBF_SYNCIO, "SYNCIO" }, \
76 { XBF_FUA, "FUA" }, \
77 { XBF_FLUSH, "FLUSH" }, \
Carlos Maiolino6fb8a902012-08-10 15:01:51 -030078 { XBF_TRYLOCK, "TRYLOCK" }, /* should never be set */\
Dave Chinner611c9942012-04-23 15:59:07 +100079 { XBF_UNMAPPED, "UNMAPPED" }, /* ditto */\
Christoph Hellwig0b1b2132009-12-14 23:14:59 +000080 { _XBF_PAGES, "PAGES" }, \
Dave Chinner0e6e8472011-03-26 09:16:45 +110081 { _XBF_KMEM, "KMEM" }, \
Dave Chinnercbb7baab2012-06-22 18:50:08 +100082 { _XBF_DELWRI_Q, "DELWRI_Q" }, \
Dave Chinnera4082352013-08-28 10:18:06 +100083 { _XBF_COMPOUND, "COMPOUND" }
84
Dave Chinnerac8809f2013-12-12 16:34:38 +110085
Dave Chinnera4082352013-08-28 10:18:06 +100086/*
87 * Internal state flags.
88 */
89#define XFS_BSTATE_DISPOSE (1 << 0) /* buffer being discarded */
Christoph Hellwig0b1b2132009-12-14 23:14:59 +000090
Eric Sandeen7c71ee72014-01-21 16:46:23 -060091/*
92 * The xfs_buftarg contains 2 notions of "sector size" -
93 *
94 * 1) The metadata sector size, which is the minimum unit and
95 * alignment of IO which will be performed by metadata operations.
96 * 2) The device logical sector size
97 *
98 * The first is specified at mkfs time, and is stored on-disk in the
99 * superblock's sb_sectsize.
100 *
101 * The latter is derived from the underlying device, and controls direct IO
102 * alignment constraints.
103 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104typedef struct xfs_buftarg {
Nathan Scottce8e9222006-01-11 15:39:08 +1100105 dev_t bt_dev;
106 struct block_device *bt_bdev;
Dave Chinner0e6e8472011-03-26 09:16:45 +1100107 struct backing_dev_info *bt_bdi;
Dave Chinnerebad8612010-09-22 10:47:20 +1000108 struct xfs_mount *bt_mount;
Eric Sandeen6da54172014-01-21 16:45:52 -0600109 unsigned int bt_meta_sectorsize;
110 size_t bt_meta_sectormask;
Eric Sandeen7c71ee72014-01-21 16:46:23 -0600111 size_t bt_logical_sectorsize;
112 size_t bt_logical_sectormask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113
Dave Chinnerff57ab22010-11-30 17:27:57 +1100114 /* LRU control structures */
115 struct shrinker bt_shrinker;
Dave Chinnere80dfa12013-08-28 10:18:05 +1000116 struct list_lru bt_lru;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117} xfs_buftarg_t;
118
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119struct xfs_buf;
Nathan Scottce8e9222006-01-11 15:39:08 +1100120typedef void (*xfs_buf_iodone_t)(struct xfs_buf *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121
Dave Chinnerc3f8fc72012-11-12 22:54:01 +1100122
Nathan Scottce8e9222006-01-11 15:39:08 +1100123#define XB_PAGES 2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124
Dave Chinnercbb7baab2012-06-22 18:50:08 +1000125struct xfs_buf_map {
126 xfs_daddr_t bm_bn; /* block number for I/O */
127 int bm_len; /* size of I/O */
128};
129
Dave Chinner3e85c862012-06-22 18:50:09 +1000130#define DEFINE_SINGLE_BUF_MAP(map, blkno, numblk) \
131 struct xfs_buf_map (map) = { .bm_bn = (blkno), .bm_len = (numblk) };
132
Dave Chinner1813dd62012-11-14 17:54:40 +1100133struct xfs_buf_ops {
134 void (*verify_read)(struct xfs_buf *);
135 void (*verify_write)(struct xfs_buf *);
136};
137
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138typedef struct xfs_buf {
Dave Chinner50f59e82010-09-24 19:59:15 +1000139 /*
140 * first cacheline holds all the fields needed for an uncontended cache
141 * hit to be fully processed. The semaphore straddles the cacheline
142 * boundary, but the counter and lock sits on the first cacheline,
143 * which is the only bit that is touched if we hit the semaphore
144 * fast-path on locking.
145 */
Dave Chinner74f75a02010-09-24 19:59:04 +1000146 struct rb_node b_rbnode; /* rbtree node */
Dave Chinnercbb7baab2012-06-22 18:50:08 +1000147 xfs_daddr_t b_bn; /* block number of buffer */
Dave Chinner4e94b712012-04-23 15:58:51 +1000148 int b_length; /* size of buffer in BBs */
Dave Chinner50f59e82010-09-24 19:59:15 +1000149 atomic_t b_hold; /* reference count */
Dave Chinner430cbeb2010-12-02 16:30:55 +1100150 atomic_t b_lru_ref; /* lru reclaim ref count */
Dave Chinner50f59e82010-09-24 19:59:15 +1000151 xfs_buf_flags_t b_flags; /* status flags */
152 struct semaphore b_sema; /* semaphore for lockables */
153
Carlos Maiolino6fb8a902012-08-10 15:01:51 -0300154 /*
155 * concurrent access to b_lru and b_lru_flags are protected by
156 * bt_lru_lock and not by b_sema
157 */
Dave Chinner430cbeb2010-12-02 16:30:55 +1100158 struct list_head b_lru; /* lru list */
Dave Chinnera4082352013-08-28 10:18:06 +1000159 spinlock_t b_lock; /* internal state lock */
160 unsigned int b_state; /* internal state flags */
Dave Chinner61be9c52014-10-02 09:04:31 +1000161 int b_io_error; /* internal IO error state */
Dave Chinner50f59e82010-09-24 19:59:15 +1000162 wait_queue_head_t b_waiters; /* unpin waiters */
163 struct list_head b_list;
164 struct xfs_perag *b_pag; /* contains rbtree root */
165 xfs_buftarg_t *b_target; /* buffer target (device) */
Nathan Scottce8e9222006-01-11 15:39:08 +1100166 void *b_addr; /* virtual address of buffer */
Brian Fosterb29c70f2014-12-04 09:43:17 +1100167 struct work_struct b_ioend_work;
168 struct workqueue_struct *b_ioend_wq; /* I/O completion wq */
Nathan Scottce8e9222006-01-11 15:39:08 +1100169 xfs_buf_iodone_t b_iodone; /* I/O completion function */
David Chinnerb4dd3302008-08-13 16:36:11 +1000170 struct completion b_iowait; /* queue for I/O waiters */
Nathan Scottce8e9222006-01-11 15:39:08 +1100171 void *b_fspriv;
Christoph Hellwigbf9d9012011-07-13 13:43:49 +0200172 struct xfs_trans *b_transp;
Nathan Scottce8e9222006-01-11 15:39:08 +1100173 struct page **b_pages; /* array of page pointers */
174 struct page *b_page_array[XB_PAGES]; /* inline pages */
Dave Chinner3e85c862012-06-22 18:50:09 +1000175 struct xfs_buf_map *b_maps; /* compound buffer map */
Mark Tinguelyd44d9bc2012-12-04 17:18:02 -0600176 struct xfs_buf_map __b_map; /* inline compound buffer map */
Dave Chinner3e85c862012-06-22 18:50:09 +1000177 int b_map_count;
Dave Chinneraa0e8832012-04-23 15:58:52 +1000178 int b_io_length; /* IO size in BBs */
Dave Chinner50f59e82010-09-24 19:59:15 +1000179 atomic_t b_pin_count; /* pin count */
180 atomic_t b_io_remaining; /* #outstanding I/O requests */
181 unsigned int b_page_count; /* size of page array */
182 unsigned int b_offset; /* page offset in first page */
Dave Chinner24513372014-06-25 14:58:08 +1000183 int b_error; /* error code on I/O */
Dave Chinner1813dd62012-11-14 17:54:40 +1100184 const struct xfs_buf_ops *b_ops;
Dave Chinnercfb02852012-11-12 22:54:19 +1100185
Nathan Scottce8e9222006-01-11 15:39:08 +1100186#ifdef XFS_BUF_LOCK_TRACKING
187 int b_last_holder;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188#endif
189} xfs_buf_t;
190
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191/* Finding and Reading Buffers */
Dave Chinner3e85c862012-06-22 18:50:09 +1000192struct xfs_buf *_xfs_buf_find(struct xfs_buftarg *target,
193 struct xfs_buf_map *map, int nmaps,
194 xfs_buf_flags_t flags, struct xfs_buf *new_bp);
195
196static inline struct xfs_buf *
197xfs_incore(
198 struct xfs_buftarg *target,
199 xfs_daddr_t blkno,
200 size_t numblks,
201 xfs_buf_flags_t flags)
202{
203 DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
204 return _xfs_buf_find(target, &map, 1, flags, NULL);
205}
206
207struct xfs_buf *_xfs_buf_alloc(struct xfs_buftarg *target,
208 struct xfs_buf_map *map, int nmaps,
209 xfs_buf_flags_t flags);
210
211static inline struct xfs_buf *
212xfs_buf_alloc(
213 struct xfs_buftarg *target,
214 xfs_daddr_t blkno,
215 size_t numblks,
216 xfs_buf_flags_t flags)
217{
218 DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
219 return _xfs_buf_alloc(target, &map, 1, flags);
220}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221
Dave Chinner6dde2702012-06-22 18:50:10 +1000222struct xfs_buf *xfs_buf_get_map(struct xfs_buftarg *target,
223 struct xfs_buf_map *map, int nmaps,
224 xfs_buf_flags_t flags);
225struct xfs_buf *xfs_buf_read_map(struct xfs_buftarg *target,
226 struct xfs_buf_map *map, int nmaps,
Dave Chinner1813dd62012-11-14 17:54:40 +1100227 xfs_buf_flags_t flags,
228 const struct xfs_buf_ops *ops);
Dave Chinner6dde2702012-06-22 18:50:10 +1000229void xfs_buf_readahead_map(struct xfs_buftarg *target,
Dave Chinnerc3f8fc72012-11-12 22:54:01 +1100230 struct xfs_buf_map *map, int nmaps,
Dave Chinner1813dd62012-11-14 17:54:40 +1100231 const struct xfs_buf_ops *ops);
Dave Chinner6dde2702012-06-22 18:50:10 +1000232
233static inline struct xfs_buf *
234xfs_buf_get(
235 struct xfs_buftarg *target,
236 xfs_daddr_t blkno,
237 size_t numblks,
238 xfs_buf_flags_t flags)
239{
240 DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
241 return xfs_buf_get_map(target, &map, 1, flags);
242}
243
244static inline struct xfs_buf *
245xfs_buf_read(
246 struct xfs_buftarg *target,
247 xfs_daddr_t blkno,
248 size_t numblks,
Dave Chinnerc3f8fc72012-11-12 22:54:01 +1100249 xfs_buf_flags_t flags,
Dave Chinner1813dd62012-11-14 17:54:40 +1100250 const struct xfs_buf_ops *ops)
Dave Chinner6dde2702012-06-22 18:50:10 +1000251{
252 DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
Dave Chinner1813dd62012-11-14 17:54:40 +1100253 return xfs_buf_read_map(target, &map, 1, flags, ops);
Dave Chinner6dde2702012-06-22 18:50:10 +1000254}
255
256static inline void
257xfs_buf_readahead(
258 struct xfs_buftarg *target,
259 xfs_daddr_t blkno,
Dave Chinnerc3f8fc72012-11-12 22:54:01 +1100260 size_t numblks,
Dave Chinner1813dd62012-11-14 17:54:40 +1100261 const struct xfs_buf_ops *ops)
Dave Chinner6dde2702012-06-22 18:50:10 +1000262{
263 DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
Dave Chinner1813dd62012-11-14 17:54:40 +1100264 return xfs_buf_readahead_map(target, &map, 1, ops);
Dave Chinner6dde2702012-06-22 18:50:10 +1000265}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266
Dave Chinnere70b73f2012-04-23 15:58:49 +1000267struct xfs_buf *xfs_buf_get_empty(struct xfs_buftarg *target, size_t numblks);
Dave Chinnere70b73f2012-04-23 15:58:49 +1000268void xfs_buf_set_empty(struct xfs_buf *bp, size_t numblks);
269int xfs_buf_associate_memory(struct xfs_buf *bp, void *mem, size_t length);
270
271struct xfs_buf *xfs_buf_get_uncached(struct xfs_buftarg *target, size_t numblks,
272 int flags);
Dave Chinnerba372672014-10-02 09:05:32 +1000273int xfs_buf_read_uncached(struct xfs_buftarg *target, xfs_daddr_t daddr,
274 size_t numblks, int flags, struct xfs_buf **bpp,
275 const struct xfs_buf_ops *ops);
Dave Chinnere70b73f2012-04-23 15:58:49 +1000276void xfs_buf_hold(struct xfs_buf *bp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277
278/* Releasing Buffers */
Nathan Scottce8e9222006-01-11 15:39:08 +1100279extern void xfs_buf_free(xfs_buf_t *);
280extern void xfs_buf_rele(xfs_buf_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281
282/* Locking and Unlocking Buffers */
Christoph Hellwig0c842ad2011-07-08 14:36:19 +0200283extern int xfs_buf_trylock(xfs_buf_t *);
Nathan Scottce8e9222006-01-11 15:39:08 +1100284extern void xfs_buf_lock(xfs_buf_t *);
285extern void xfs_buf_unlock(xfs_buf_t *);
Christoph Hellwig0c842ad2011-07-08 14:36:19 +0200286#define xfs_buf_islocked(bp) \
287 ((bp)->b_sema.count <= 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288
289/* Buffer Read and Write Routines */
Christoph Hellwigc2b006c2011-08-23 08:28:07 +0000290extern int xfs_bwrite(struct xfs_buf *bp);
Dave Chinnere8aaba92014-10-02 09:04:22 +1000291extern void xfs_buf_ioend(struct xfs_buf *bp);
Nathan Scottce8e9222006-01-11 15:39:08 +1100292extern void xfs_buf_ioerror(xfs_buf_t *, int);
Christoph Hellwig901796a2011-10-10 16:52:49 +0000293extern void xfs_buf_ioerror_alert(struct xfs_buf *, const char *func);
Dave Chinner595bff72014-10-02 09:05:14 +1000294extern void xfs_buf_submit(struct xfs_buf *bp);
295extern int xfs_buf_submit_wait(struct xfs_buf *bp);
Dave Chinnerb9c48642010-01-20 10:47:39 +1100296extern void xfs_buf_iomove(xfs_buf_t *, size_t, size_t, void *,
Nathan Scottce8e9222006-01-11 15:39:08 +1100297 xfs_buf_rw_t);
Christoph Hellwig1a1a3e92010-10-06 18:41:18 +0000298#define xfs_buf_zero(bp, off, len) \
299 xfs_buf_iomove((bp), (off), (len), NULL, XBRW_ZERO)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301/* Buffer Utility Routines */
Nathan Scottce8e9222006-01-11 15:39:08 +1100302extern xfs_caddr_t xfs_buf_offset(xfs_buf_t *, size_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304/* Delayed Write Buffer Routines */
Christoph Hellwig43ff2122012-04-23 15:58:39 +1000305extern bool xfs_buf_delwri_queue(struct xfs_buf *, struct list_head *);
306extern int xfs_buf_delwri_submit(struct list_head *);
307extern int xfs_buf_delwri_submit_nowait(struct list_head *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308
309/* Buffer Daemon Setup Routines */
Nathan Scottce8e9222006-01-11 15:39:08 +1100310extern int xfs_buf_init(void);
311extern void xfs_buf_terminate(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312
Christoph Hellwig1d5ae5d2011-07-08 14:36:32 +0200313#define XFS_BUF_ZEROFLAGS(bp) \
Christoph Hellwig43ff2122012-04-23 15:58:39 +1000314 ((bp)->b_flags &= ~(XBF_READ|XBF_WRITE|XBF_ASYNC| \
Dave Chinnerac8809f2013-12-12 16:34:38 +1100315 XBF_SYNCIO|XBF_FUA|XBF_FLUSH| \
316 XBF_WRITE_FAIL))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317
Dave Chinner430cbeb2010-12-02 16:30:55 +1100318void xfs_buf_stale(struct xfs_buf *bp);
Christoph Hellwig0cadda12010-01-19 09:56:44 +0000319#define XFS_BUF_UNSTALE(bp) ((bp)->b_flags &= ~XBF_STALE)
320#define XFS_BUF_ISSTALE(bp) ((bp)->b_flags & XBF_STALE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321
Nathan Scottce8e9222006-01-11 15:39:08 +1100322#define XFS_BUF_DONE(bp) ((bp)->b_flags |= XBF_DONE)
323#define XFS_BUF_UNDONE(bp) ((bp)->b_flags &= ~XBF_DONE)
324#define XFS_BUF_ISDONE(bp) ((bp)->b_flags & XBF_DONE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325
Nathan Scottce8e9222006-01-11 15:39:08 +1100326#define XFS_BUF_ASYNC(bp) ((bp)->b_flags |= XBF_ASYNC)
327#define XFS_BUF_UNASYNC(bp) ((bp)->b_flags &= ~XBF_ASYNC)
328#define XFS_BUF_ISASYNC(bp) ((bp)->b_flags & XBF_ASYNC)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329
Nathan Scottce8e9222006-01-11 15:39:08 +1100330#define XFS_BUF_READ(bp) ((bp)->b_flags |= XBF_READ)
331#define XFS_BUF_UNREAD(bp) ((bp)->b_flags &= ~XBF_READ)
332#define XFS_BUF_ISREAD(bp) ((bp)->b_flags & XBF_READ)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333
Nathan Scottce8e9222006-01-11 15:39:08 +1100334#define XFS_BUF_WRITE(bp) ((bp)->b_flags |= XBF_WRITE)
335#define XFS_BUF_UNWRITE(bp) ((bp)->b_flags &= ~XBF_WRITE)
336#define XFS_BUF_ISWRITE(bp) ((bp)->b_flags & XBF_WRITE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337
Dave Chinnercbb7baab2012-06-22 18:50:08 +1000338/*
339 * These macros use the IO block map rather than b_bn. b_bn is now really
340 * just for the buffer cache index for cached buffers. As IO does not use b_bn
341 * anymore, uncached buffers do not use b_bn at all and hence must modify the IO
342 * map directly. Uncached buffers are not allowed to be discontiguous, so this
343 * is safe to do.
344 *
345 * In future, uncached buffers will pass the block number directly to the io
346 * request function and hence these macros will go away at that point.
347 */
Mark Tinguelyd44d9bc2012-12-04 17:18:02 -0600348#define XFS_BUF_ADDR(bp) ((bp)->b_maps[0].bm_bn)
349#define XFS_BUF_SET_ADDR(bp, bno) ((bp)->b_maps[0].bm_bn = (xfs_daddr_t)(bno))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350
Christoph Hellwig38f23232011-10-10 16:52:45 +0000351static inline void xfs_buf_set_ref(struct xfs_buf *bp, int lru_ref)
Dave Chinner821eb212010-12-02 16:31:13 +1100352{
353 atomic_set(&bp->b_lru_ref, lru_ref);
354}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355
Chandra Seetharaman811e64c2011-07-22 23:40:27 +0000356static inline int xfs_buf_ispinned(struct xfs_buf *bp)
357{
358 return atomic_read(&bp->b_pin_count);
359}
Nathan Scottce8e9222006-01-11 15:39:08 +1100360
Nathan Scottce8e9222006-01-11 15:39:08 +1100361static inline void xfs_buf_relse(xfs_buf_t *bp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362{
Christoph Hellwigbfc60172011-01-07 13:02:23 +0000363 xfs_buf_unlock(bp);
Nathan Scottce8e9222006-01-11 15:39:08 +1100364 xfs_buf_rele(bp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365}
366
Eric Sandeen51582172014-02-27 15:17:27 +1100367static inline int
368xfs_buf_verify_cksum(struct xfs_buf *bp, unsigned long cksum_offset)
369{
370 return xfs_verify_cksum(bp->b_addr, BBTOB(bp->b_length),
371 cksum_offset);
372}
373
Eric Sandeenf1dbcd72014-02-27 15:18:23 +1100374static inline void
375xfs_buf_update_cksum(struct xfs_buf *bp, unsigned long cksum_offset)
376{
377 xfs_update_cksum(bp->b_addr, BBTOB(bp->b_length),
378 cksum_offset);
379}
380
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381/*
382 * Handling of buftargs.
383 */
Dave Chinnerebad8612010-09-22 10:47:20 +1000384extern xfs_buftarg_t *xfs_alloc_buftarg(struct xfs_mount *,
Eric Sandeen34dcefd2014-04-14 19:01:00 +1000385 struct block_device *);
Christoph Hellwigc141b292009-03-03 14:48:37 -0500386extern void xfs_free_buftarg(struct xfs_mount *, struct xfs_buftarg *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387extern void xfs_wait_buftarg(xfs_buftarg_t *);
Eric Sandeena96c4152014-04-14 19:00:29 +1000388extern int xfs_setsize_buftarg(xfs_buftarg_t *, unsigned int);
Dave Chinnerd808f612010-02-02 10:13:42 +1100389
Nathan Scottce8e9222006-01-11 15:39:08 +1100390#define xfs_getsize_buftarg(buftarg) block_size((buftarg)->bt_bdev)
391#define xfs_readonly_buftarg(buftarg) bdev_read_only((buftarg)->bt_bdev)
392
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393#endif /* __XFS_BUF_H__ */